There are four sections in DU LLB Entrance Examination-  English language, analytical skills, legal awareness  and aptitude, general knowledge and current affairs.

In English language section, there will be questions from grammar, unseen passage,  antonyms-synonyms, fill in the blanks etc. The best way to prepare is to refer any comprehensive grammar book and read any one english newspaper daily.

Analytical skills section includes maths, reasoning, aptitude etc. For this, you should revise maths books of class V to X. Also there will be questions from seat arrangement, blood relation, speed, time and distance, coding decoding, syllogism etc.

Universal DU LLB guide is considered very helpful for both legal awareness and legal aptitude sections. You should try to complete the entire legal aptitude section.

Reading newspapers regularly will extremely help you to be aware of the current affairs. For general knowledge section, you can refer to these books- Manorama Year book, India Year Book etc.

If possible you should make a proper study plan and do accordingly. There are many mock tests booklets available in the market, choose any one of them and start solving the mock papers. Solving previous year papers will help you to get accustomed.